A U.S. Navy Mark 12, Type 3 submarine torpedo gyroscope
the gyroscope is made of stainless steel and bronze, and in the original combat-ready double case, marked 'MK 12 - 3/Gyro/77363' 4-1/2 x 4-3/4 in. (11.4 x 12 cm.) the gyroscope. (4)
Provenance: The War Museum
WWII era torpedoes using these gyros could be fired from a submarine, surface ship, PT boat or dropped from an aircraft. The gyro kept the torpedo headed on a straight course, not allowing it to go in circles. Sperry's gyrocompass evolved through many models and was in huge demand during World War II. The Sperry gyrocompass revolutionized navigation on land, sea and air.